1257678172 has 48 divisors (see below), whose sum is σ = 2361264640. Its totient is φ = 584381952.

The previous prime is 1257678143. The next prime is 1257678179. The reversal of 1257678172 is 2718767521.

It is a super-3 number, since 3×1257678172³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257678179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1868428 + ... + 1869100.

Almost surely, 2^1257678172 is an apocalyptic number.

It is an amenable number.

1257678172 is a deficient number, since it is larger than the sum of its proper divisors (1103586468).

1257678172 is a wasteful number, since it uses less digits than its factorization.

1257678172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1130 (or 1128 counting only the distinct ones).

The product of its digits is 329280, while the sum is 46.

The square root of 1257678172 is about 35463.7585712513. The cubic root of 1257678172 is about 1079.4184603528.

The spelling of 1257678172 in words is "one billion, two hundred fifty-seven million, six hundred seventy-eight thousand, one hundred seventy-two".